IIRC that particular side saddle was one of Matt's normal rotation cards that he'd had for 5 or 10 years and used and abused. Plus we were feeding out fanny packs as much as we were loading from the side since they day was about push/pull, not loading fundamentals (James had that down pat from his time with Clint), so it got shook quite a bit without getting reset.
All that to say don't blame the card too much on that one. It was a VERY worn Vang Comp shell card. I still think those are the best around and run them on my personal gun, as does Matt, and a number of other shotgun instructors who I trust.